单项选择题

A scientist does not accept statements which are not based on the most complete evidence available. Instead, he always checks, studies and makes experiments carefully and objectively to ______ them.

A．testify
B．verify
C．affirm
D．assert
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单项选择题
Wang Qing did not come to the meeting; he______ the notice on the blackboard since we saw it on our way to the dining hall.
A．must not have missed
B．could not miss
C．could not have missed
D．wouldn't have missed
单项选择题
The rising crime rate has become major concern of______ society.
A．the, the
B．a, /
C．/, the
D．a, a
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